TWAS Arab Regional Partner (TWAS-AREP)
- Algeria
- Bahrain
- Comoros
- Djibouti
- Egypt
- Iraq
- Jordan
- Kuwait
- Lebanon
- Libya
- Mauritania
- Morocco
- Oman
- Palestine (West Bank and Gaza Strip)
- Qatar
- Saudi Arabia
- Somalia
- Sudan
- Syria
- Tunisia
- United Arab Emirates
- Yemen
TWAS Central and South Asia Regional Partner (TWAS-CASAREP)
- Afghanistan
- Azerbaijan
- Bangladesh
- India
- Iran, Isl. Rep.
- Kazakhstan
- Kyrgyzstan
- Maldives
- Nepal
- Pakistan
- Sri Lanka
- Tajikistan
- Türkiye
- Turkmenistan
- Uzbekistan
TWAS East and South-East Asia and the Pacific Regional Partner (TWAS-SAPREP)
- Bhutan
- Brunei
- Cambodia
- China
- Taiwan, China
- Fiji
- Indonesia
- Kiribati
- Lao PDR
- Malaysia
- Marshall Islands
- Micronesia
- Mongolia
- Myanmar
- Nauru
- Palau
- Papua New Guinea
- Philippines
- Samoa
- Solomon Islands
- Thailand
- Timor-Leste
- Tonga
- Tuvalu
- Vanuatu
- Vietnam
TWAS Sub-Saharan Africa Regional Partner (TWAS-SAREP)
- Angola
- Benin
- Botswana
- Burkina Faso
- Burundi
- Cameroon
- Cape Verde
- Central African Rep.
- Chad
- Congo, Dem. Rep.
- Congo, Rep.
- Côte d'Ivoire
- Eritrea
- eSwatini
- Ethiopia
- Gabon
- Gambia
- Ghana
- Guinea
- Guinea Equatorial
- Guinea-Bissau
- Kenya
- Lesotho
- Liberia
- Madagascar
- Malawi
- Mali
- Mauritius
- Mozambique
- Namibia
- Niger
- Nigeria
- Rwanda
- São Tomé and Príncipe
- Senegal
- Seychelles
- Sierra Leone
- South Africa
- South Sudan
- Tanzania
- Togo
- Uganda
- Zambia
- Zimbabwe
TWAS Latin America and the Caribbean Regional Partner (TWAS-LACREP)
- Antigua and Barbuda
- Argentina
- Aruba
- Bahamas
- Barbados
- Belize
- Bolivia
- Brazil
- Chile
- Colombia
- Costa Rica
- Cuba
- Dominica
- Dominican Rep.
- Ecuador
- El Salvador
- Grenada
- Guadeloupe
- Guatemala
- Guyana
- Haiti
- Honduras
- Jamaica
- Mexico
- Nicaragua
- Panama
- Paraguay
- Peru
- Saint Vincent and the Grenadines
- Suriname
- Trinidad and Tobago
- Uruguay
- Venezuela